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SystemImpl.hpp
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//===-- core/SystemImpl.hpp -------------------------------------*- C++ -*-===//
//
// The RoSA Framework
//
// Distributed under the terms and conditions of the Boost Software License 1.0.
// See accompanying file LICENSE.
//
// If you did not receive a copy of the license file, see
// http://www.boost.org/LICENSE_1_0.txt.
//
//===----------------------------------------------------------------------===//
///
/// \file core/SystemImpl.hpp
///
/// \author David Juhasz (david.juhasz@tuwien.ac.at)
///
/// \date 2017
///
/// \brief Declaration of a basic implementation of the \c rosa::System
/// interface.
///
//===----------------------------------------------------------------------===//
#ifndef ROSA_LIB_CORE_SYSTEMIMPL_HPP
#define ROSA_LIB_CORE_SYSTEMIMPL_HPP
#include "rosa/core/SystemBase.hpp"
#include <mutex>
#include <unordered_set>
namespace rosa {
/// A basic implementation of the \c rosa::System interface, which is based on
/// \c rosa::SystemBase and simply stores \c rosa::Unit instances in a set.
class SystemImpl : public SystemBase {
public:
/// Creates a new instance.
///
/// \param Name name of the new instance
SystemImpl(const std::string &Name) noexcept;
/// Destroys \p this object.
///
/// \note The destructor deallocates internal resources and marks \p this
/// object cleaned.
///
/// \pre No live \c rosa::Unit instances are managed by \p this object:\code
/// empty()
/// \endcode
~SystemImpl(void);
private:
/// Stores references for the registered \c rosa::Unit instances.
std::unordered_set<Unit *> Units;
/// Provides mutual exclusion when modifying \c rosa::Unit instances.
std::mutex RegisterMutex;
protected:
/// Registers a \c rosa::Unit instance to \p this object.
///
/// \param U \c rosa::Unit to register
///
/// \pre \p this object has not yet been marked as cleaned and \p U is not
/// registered yet:\code
/// !isSystemCleaned() && !isUnitRegistered(U)
/// \endcode
///
/// \post \p U is registered:\code
/// isUnitRegistered(U)
/// \endcode
void registerUnit(Unit &U) noexcept override;
/// Unregisters and destroys a registered \c rosa::Unit instance.
///
/// \param U \c rosa::Unit to destroy
///
/// \pre \p U is registered:\code
/// isUnitRegistered(U)
/// \endcode
///
/// \post \p U is not registered:\code
/// !isUnitRegistered(U)
/// \endcode Moreover, \p U is destroyed.
void destroyUnit(Unit &U) noexcept override;
/// Tells if a \c rosa::Unit is registered in \p this object.
///
/// \param U \c rosa::Unit to check
///
/// \return whether \p U is registered in \p this object
bool isUnitRegistered(const Unit &U) const noexcept override;
public:
/// Tells the number of live \c rosa::Unit instances in the context \p this
/// object, those being constructed and not destroyed yet.
///
/// \return number of \c rosa::Unit instances alive
size_t numberOfLiveUnits(void) const noexcept override;
/// Tells if \p this object has no live \c rosa::Unit instances.
///
/// \return whether \p this object has any live \c rosa::Unit instances
bool empty(void) const noexcept override;
};
} // End namespace rosa
#endif // ROSA_LIB_CORE_SYSTEMIMPL_HPP

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